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Issue 33, 2017
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The influence of topological phase transition on the superfluid density of overdoped copper oxides

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Abstract

We show that a quantum phase transition, generating flat bands and altering Fermi surface topology, is a primary reason for the exotic behavior of the overdoped high-temperature superconductors represented by La2−xSrxCuO4, whose superconductivity features differ from what is predicted by the classical Bardeen–Cooper–Schrieffer theory. This observation can open avenues for chemical preparation of high-Tc materials. We demonstrate that (1) at temperature T = 0, the superfluid density ns turns out to be considerably smaller than the total electron density; (2) the critical temperature Tc is controlled by ns rather than by doping, and is a linear function of the ns; (3) at T > Tc the resistivity ρ(T) varies linearly with temperature, ρ(T) ∝ αT, where α diminishes with Tc → 0, whereas in the normal (non superconducting) region induced by overdoping, Tc = 0, and ρ(T) ∝ T2. Our results are in good agreement with recent experimental observations.

Graphical abstract: The influence of topological phase transition on the superfluid density of overdoped copper oxides

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Publication details

The article was received on 25 Apr 2017, accepted on 31 Jul 2017 and first published on 31 Jul 2017


Article type: Paper
DOI: 10.1039/C7CP02720F
Citation: Phys. Chem. Chem. Phys., 2017,19, 21964-21969
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    The influence of topological phase transition on the superfluid density of overdoped copper oxides

    V. R. Shaginyan, V. A. Stephanovich, A. Z. Msezane, G. S. Japaridze and K. G. Popov, Phys. Chem. Chem. Phys., 2017, 19, 21964
    DOI: 10.1039/C7CP02720F

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